The person I went with who was sold on the trailer said the same as me. And there is nothing within the first 5 or 30 mins that'll make anyone freak out...there is one part that may make you jump, but that's it.
Its funny because I didn't think it was film I really needed to see at the cinema and im usually about the big visual if I have to. But weirdly, watching this I actually noticed the sounds more, probably because it was so tense in parts.